Preparation of Zinc Phosphate Glass-Derived Hydrogels and Their Proton Conductivities
When fine-sized 45ZnO·55P2O5 or 50ZnO·50P2O5 glass powders were mixed with distilled water, hydration immediately occurred, resulting in the formation of viscous hydrogels. 31P MAS-NMR spectra showed that the hydrogels contain orthophosphates and long-chain phosphates; no significant differences in their structures between the hydrogels were shown. The 45ZP gel and 50ZP gel showed high conductivities (e.g., 9.9 and 2.8 mS/cm, respectively, at 30°C). The conductivities were related to the proton amount in the hydrogel; the amount in the 45ZP gel was larger than that in the 50ZP gel. Electric double-layer capacitors (EDCs) were prepared using electrolytes consisting of the hydrogels. The specific capacities of the EDC cell for the 45ZP gel and 50ZP gel were 2.40 and 2.06 F/g, respectively. The possibility as an EDC electrolyte may be related to proton conductivities of the hydrogels.
Masayuki Nogami, Riguang Jin, Toshihiro Kasuga and Wantai Yang
T. Akamatsu et al., "Preparation of Zinc Phosphate Glass-Derived Hydrogels and Their Proton Conductivities", Advanced Materials Research, Vols. 11-12, pp. 153-158, 2006